A3961SB

The A3961SB is a dual full-bridge PWM Motor Driver designed for pulse-width modulated current control of bipolar stepper motor and the A3961S is capable of continuous output currents to ±800mA and operating voltages to 45V. Internal fixed OFF-time PWM current-control circuitry can be used to regulate the maximum load current to a desired value. An internal precision voltage reference is provided to improve motor peak current control accuracy. The peak load current limit is set by the user's selection of an external resistor divider and current-sensing resistors. The fixed OFF-time pulse duration is set by user-selected external RC timing networks. The capacitor in the RC timing network also determines user-selectable blanking window that prevents false triggering of the PWM current control circuitry during switching transitions. This eliminates the need for two external RC filter networks on the current-sensing comparator inputs.

• Internal PWM current control, saturated sink driver
• Internally generated precision 2.5V reference
• Internal transient-suppression diodes
• Internal thermal-shutdown circuitry
• Crossover-current protection, UVLO protection

Applications

Motor Drive & Control